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A permanent-magnet automotive fan motor draws 20 A from a 12-V source when the rotor is locked (i.e., held motionless).
a. Find the armature resistance.
b. Find the maximum developed power that this motor can produce when operated from a 12-V source.
c. Repeat part (b) for operation at 10V (this represents a nearly dead battery) and at 14V (this is the terminal voltage during charging of the battery after the engine is started).
Your friends Alice and Bob have two children. You recall that one is a boy. What is the probability that the other is a girl Hint: Think carefully about the sample space.
An Electrical System is rated 10kVA, 200V at a .5 leading the power factor. a. determine the impedance of the system in rectangular coordinates. b. find the average power delivered to the system
In transformer designs, often you can find an air gap in the core. In all the electric machines, there is an air gap between the stator and rotor. In both cases, flux will go through both core material and the air gap.
If we now decide to use Rg = 1K ohm, what value of input capacitor would be adequate to couple at least 95% of the voltage of a sinusoidal input signal of 10 KHZ to the GATE OF COMMON SOURCE AMPLIFIER
In an AC generator the magnetic field is .05T, the number of loops is 12, the operating temperature is 90degC, the rotational speed is 50cps, the power factor is .96 leading and the are enclosed by one loop is 2 sqft.
Let E = yax V/m at a certain instant of time, and calculate the work required to move a 3-C charge from (1,3,5) to (2,0,3) along the straight-line segments joining: a) (1,3,5) to (2,3,5) to (2,0,5) to (2,0,3) b) (1,3,5) to (1,3,3) to (1,0,3) to (2,..
Using a shorted stub to match load, what is the lenght of the line where the normalized input Y is 1 + jb . If the characteristic impedance of the shorted line is 40 ohms, what is the length of the stub length.
Suppose that the voltage v(t) is then inputted to a differentiator circuit. Find the matrix representation of the differentiation operation with respect to the basis B. Verify your derivative using your knowledge from calculus.
A 1.2 MW wind turbine has a rotor diameter of 64 m. the turbine operates in an area with an average wind velocity of 7.5 m/s and the air density of 1.18 kg/m^3. the turbine power coefficient including the unit efficiency is 42.8 percent.
a)apply gauss's law to find the total flux leaving the closed surface of the cube. b)evaluate - *D at v the center of the cube. c)estimate the total charge enclosed within the cube.
Stator resistance and rotational losses may be neglected, and the rotor resistance and inductance may be assumed to be constant, independent of rotor frequency. Determine
David has a collection of resistors of various values, but all are rated for the same power capacity of 2 watts. Show how he can combine resistors to obtain an effective resistance of 50 ohms rated for 10 watts.
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